Why Choose the Lovato SG21NA300R Type 2 Surge Protection Device?
The Lovato SG21NA300R is a compact and reliable Type 2 surge protection device (SPD) designed to protect low-voltage AC electrical installations against transient overvoltages caused by indirect lightning events, induced surges and electrical switching operations. As part of the Lovato Electric SG2 series, it uses replaceable plug-in cartridges to simplify maintenance and restoration of surge protection after a cartridge reaches end of life.
Designed for 1P+N electrical systems, the SG21NA300R has a rated discharge current In of 20 kA and provides a maximum discharge current Imax of 50 kA L-N and 65 kA N-PE. Its voltage protection level Up of less than 1.5 kV helps limit potentially damaging transient voltages reaching downstream electrical and electronic equipment.
With a rated system voltage of 230 V AC and maximum continuous operating voltage Uc of 300 V AC, the SG21NA300R is suitable for single-phase AC distribution systems. The device also includes frontal operating/end-of-life indication and a remote contact, allowing SPD condition to be monitored from electrical control or building management systems.
Key Advantages
- Type 2 surge protection for low-voltage AC power systems.
- 1P+N configuration suitable for single-phase installations with neutral.
- 20 kA rated discharge current In for effective transient surge protection.
- Maximum discharge current Imax of 50 kA L-N / 65 kA N-PE.
- <1.5 kV voltage protection level Up on both L-N and N-PE paths.
- Replaceable plug-in cartridge design simplifies maintenance.
- Integrated remote contact and frontal operating/end-of-life indication.
Key Features
- Lovato Electric SG2 series.
- Type 2 surge protection device.
- 1P+N pole configuration.
- 230 V AC rated system voltage.
- 300 V AC maximum continuous operating voltage Uc.
- 20 kA rated discharge current In (8/20 µs).
- 50 / 65 kA maximum discharge current Imax (L-N / N-PE).
- <1.5 / <1.5 kV voltage protection level Up (L-N / N-PE).
- Integrated thermal protection.
- Frontal status indication and remote auxiliary contact.
- Replaceable plug-in surge protection cartridge.
- Compact two-module DIN rail design.
Reliable Protection Against Transient Overvoltages
Type 2 surge protection devices such as the Lovato SG21NA300R are designed to divert transient surge currents away from sensitive electrical equipment while limiting the voltage appearing across the protected installation. They are commonly used to protect against indirect lightning effects and switching-generated overvoltages within low-voltage distribution systems.
The SG2 series combines high surge discharge capability with replaceable plug-in cartridges, thermal protection and clear status indication. The SG21NA300R additionally incorporates remote signalling, making it suitable for installations where the condition of the surge protection device needs to be monitored from a control system or remote location.
Typical Applications
- Single-phase electrical distribution boards.
- Residential and commercial electrical installations.
- Industrial control and distribution panels.
- Building services and automation systems.
- Electrical installations containing sensitive electronic equipment.
- AC power systems requiring Type 2 transient overvoltage protection.
